The 9 Rules of Object Calisthenics

Calisthenics.md

Object Calisthenics outlines 9 basic rules to apply when performing the exercise:

• One level of indentation per method.
• Don't use the ELSE keyword.
• Wrap all primitives and Strings in classes.
• First class collections.
• One dot per line.
• Don't abbreviate.
• Keep all classes less than 50 lines.
• No classes with more than two instance variables.
• No getters or setters.

Also see the "Your code sucks, let's fix-it" presentation by Rafael Dohms.

I have been reading it but didn't understand the concept of no getters and setters .
Will you please explain it a little bit?

@iqbalrohail,

Don’t make decisions outside of the class, let the class do its job, follows the Tell don’t ask principle.

I would prefer to see the above list as guidelines not rules. Also see https://levelup.gitconnected.com/learn-these-9-rules-to-start-writing-clean-code-immediately-a7ee40fe1e1b